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The study of policy instruments dates from the early 1970s, though much had been written previously, especially in economics, about government intervention in relation to market imperfections. A policy instrument refers to the means of government intervention in markets or, from a broader perspective, society to accomplish goals or to solve problems. The behavioral assumption underlying a policy instrument is that it attempts to get people do things that they might not otherwise have done. Since the 1960s, there has been a transformation not only in the scope and scale of the role of the government but also in the proliferation of tools that it has at its disposal for public action. In retrospect, a distinction can be made between three partly overlapping arenas in the study of policy instruments.

This entry starts with a discussion of several approaches to defining what policy instruments are. Policy instruments are not isolated but exist in relationship to objectives as well as resources; taking this into account, the next section of the entry considers theories about how a policy instrument should be chosen. A classification of policy instruments is presented, differentiating between three families of policy instruments. Next, the entry examines the choice of policy tools (policy design), the application of policy tools (policy implementation), and the second generation of less coercive and more indirect policy instruments inspired by the limited impact of earlier policy tools. The assessment of the impact of policy instruments (policy evaluation) is complicated by the fact that they often come as part of a policy mix; the entry describes policy evaluation, noting that effectiveness is just one of the many criteria by which to measure performance. The entry concludes with a look at the way ahead.

Approaches to Policy Instruments

The classical approach to defining policy instruments (1970–1985), rooted in the instrumentalist school of thought, has been largely supplanted because of its top-down and mechanical view of the world. It put quite some effort into a rather semantic discussion about the definition of a policy instrument, the risk of metaphors and reification, and the classification of policy instruments on the basis of their intrinsic characteristics. It claimed that the selection and consequently the application of instruments are made mainly on the basis of the characteristics of a specific instrument and its effects in terms of goal attainment. Soon it became clear that goal attainment cannot be attributed solely to the characteristics of instruments but that the characteristics of the context should also be taken into account.

The instrument–context approach (1985–1995) focused on the development of a theory of policy instruments that would enable policymakers to select the appropriate policy instrument for the problem at hand. The basis for selection of a policy instrument is not only the “logic of consequence” but also the “logic of appropriateness,” which includes “goodness of fit.” The attention for the context has led to what may be labeled “refined instrumentalism.”

Finally, instruments are considered one of the many variables in the contextual approach (1995–present) that takes policy implementation as a point of departure. The study of policy instruments merges with the study of implementation. The study of policy instruments has been affected as such by the developments in the field of implementation, notably the shift from implementation to governance.

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